Keyboard No Dome - no tactile feedback - lifetime > 5 million switches (DIN 42 115) - very thin (min thickness 0,6 mm) - application : systems not very often used - low budget Keyboard with Plastic Dome - a " click-effect" is created by transforming the frontfoil thermally - lifetime > 5 million switches (DIN 42 115) - very thin (min thickness 0,7 mm) - environmental factors (cold - heat - sun - moisture) can influence the feeling of switching - limited options Keyboard with Metal Dome - by installing a metal dome, a real " click-effect" is created - lifetime > 5 million switches (DIN 42 115) - very thin (min thickness 0,7 mm) - the feeling of switching is not affected by environmental factors - can be used directly on your PCB - unlimited options possible - can be used in combination with rubber keypads